Solutions for Primary & Secondary Laboratories
Solutions for Primary & Secondary Laboratories
Solutions for Primary & Secondary Laboratories
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The Perfect Gallium Point<br />
Melt 1 Day1<br />
1.1810343<br />
0.000025K 1hr<br />
1.1810342<br />
0.25mK<br />
Melt 2 Day2<br />
1.1810342<br />
1.1810343<br />
0.000025K 1hr<br />
1.1810342<br />
0.25mK<br />
Shown on the same scale<br />
Melt 3 Day3<br />
1 2 3 4<br />
1.1810343<br />
0.000025K 1hr<br />
1.1810342<br />
0.25mK<br />
1 Value of 10 years old Cell<br />
2 Value of N.P.L.’s Cell<br />
3 Value of I.M.G.C.’s Cell<br />
4 Value of Cell open <strong>for</strong> over 3 years<br />
The in<strong>for</strong>mation below is extracted from<br />
The Gallium Point, An Alternative Reference Temperature to the Water Triple Point<br />
by John P. Tavener<br />
Intercomparison<br />
of Water and Gallium<br />
Water<br />
Gallium<br />
Impurities<br />
Small<br />
Small<br />
Peritectics<br />
None<br />
None<br />
Variation with Isotopes<br />
Large<br />
None Found<br />
Interoperability<br />
Good<br />
Good<br />
Practical Variation<br />
40µK<br />
40µK<br />
H.H. Uncertainty<br />
Ruggedness<br />
Ease of Use<br />
Small<br />
Poor<br />
Difficult<br />
10µK<br />
Good<br />
Easy<br />
Apparatus<br />
Ice Bath & CO2<br />
Warm Water<br />
Price<br />
Low<br />
High<br />
The Resealable<br />
Gallium Cell<br />
Drift with Time<br />
Time be<strong>for</strong>e Best Accuracy<br />
4µK / year<br />
10 days<br />
None Detected<br />
1 to 2 hours<br />
12 | SOLUTIONS FOR PRIMARY & SECONDARY LABORATORIES
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